Thursday, February 19, 2015

Yahoo

Yahoo.  (c) Yahoo
Definition: Yahoo is one of the Web's most popular websites, offering Web search, an extensive subject directory, and many more services. If you'd like to learn more about this popular site, the following articles will help:
  • Yahoo: A Quick Look: Get a brief overview of all that this extensive Web property has to offer.
  • Yahoo Search Shortcuts: Here are the top search tricks that will make your search experience fast, fun, and ultimately efficient.
  • Ultimate Yahoo Search List - More Than Just A Search Engine: In addition to having a subject directory and search engine listings, this versatile portal has many special properties that are useful resources, including News, Music, Games, Finance, and many more.
Pronunciation: YAH-hoo
Common Misspellings: yahooo
Examples: "I used Yahoo's search engine to find the information I was looking for."

Saturday, February 14, 2015

What is Google

Google

Google logoOriginally known as BackRub, Google is a search engine that started development in 1996 by Sergey Brin and Larry Page as a research project at Stanford University. Larry and Sergey decide the name of their search engine needs to change and decide upon Google, which is inspired from the term googol. They later register the google.com domain on September 15, 1997 and incorporated the name on September 4, 1998.
What helps Google stand out from its competition and help it grow is its PageRank technique that sorts search results. In the picture below is a capture of the site from The Internet Archive of what Google looked like in 1998.
Google in 1998

Other Google services

  • Blogger - View and create your own blog.
  • Froogle - Search for products based on prices, location, type, etc.
  • Gmail - Google's free online e-mail service with over 1gb of storage.
  • Google+ - Google social networking site.
  • Google AdSense - Google service that provides and pays website publishers or blog developers to advertise on their site.
  • Google AdWords - Service that enables users to pay to advertise on the Google search engine and other websites using Google AdSense.
  • Google Alerts - Create alert text messages sent to an e-mail address each day or as it happens of web searches, news searches, etc.
  • Google Analytics - A great site for users who run a website. Google Analytics allows anyone with their own domain to have Google post great reports of visitors on their website.
  • Google App Engine - A service that provides users the ability to create scalable web services that use Google's resources.
  • Google Base - Location where you can post information and make your information searchable on Google.
  • Google Books - Another fantastic service from Google that contains hundreds of thousands of books that can be searched.
  • Google Buzz - Discontinued Google social networking site. Latest Social networking site is Google+.
  • Google Calendar - A way to organize your schedule, synchronize, and share events with your friends.
  • Google Checkout - Service that provides users and sellers with an easy and secure method of paying each other.
  • Google Code - Allows users to view source code on websites.
  • Google Custom Search Engine (CSE) - Service that allows you to create your own custom Google Search engine.
  • Google Docs - A fantastic free solution from Google that allows you to open Microsoft Office documents as well as share them with other users with Internet access.
  • Google Drive - A cloud storage service from Google introduce April 24, 2012 that allows users to view, edit, and store their documents and files in the Google cloud.
  • Google Blog - A blog maintained by Google that helps give an insight into the company.
  • Google Deskbar and Google Desktop - Small software utility that adds a Google search to the Microsoft Windows Taskbar allowing users to search without even opening a browser.
  • Google Directory - Browse the Open Directory of web pages modified to list the directory listings by Google's PageRank technology.
  • Google Earth - A fantastic software program that allows a person to view almost everywhere on earth, get directions, find close shops and places of interest, and much more.
  • Google Features - A great listing from Google of some of its different available features as well as tricks on searching for different content on Google.
  • Google Fiber - A limited service available in some places in the United States that offers a Fiber connection to the Internet.
  • Google Fonts - A collection of thousands of fonts that can be used on your web page.
  • Google Groups - Google's bulletin board with millions of users and postings.
  • Google H4x0r - Display Google's search page and results in leet speak.
  • Google Home Page - Google's main page.
  • Google Images - Google search that allows you to search for images instead of text.
  • Google Klingon - Display Google's search page and results in Klingon.
  • Google Labs - A section of Google that once displayed upcoming features. This section was later discontinued.
  • Google Mail - Alternatively referred to as Gmail, is one of the most popular email hosts.
  • Google Maps - A great feature that enables users to search for directions from one location to another, search for local businesses, and more.
  • Google Moderator - Another great free tool  from Google that allows anyone to collect the best input from an audience of any size.
  • Google Moon - In celebration of the first Moon landing, Google created this page that has a map of our Moon as well as each of the moon landings.
  • Google Ngram Viewer - Great tool that allows you to search lots of books and other printed material for the frequency of words or phrases.
  • Google Now - Service primarily used by mobile users that gives the most relevant information that relates to you based of your searching and driving habits.
  • Google Personalized - Enables Google users to personalize the Google home page, having it display the latest news they want to view, their local weather, and more.
  • Google Pig Latin - Display Google's search page and results in Pig Latin.
  • Google Sets - Type in a few keywords that are similar to pull up a listing of more words that relate to the words you typed.
  • Google Sites - A service that enables users to create and share websites.
  • Google Scholar - Allows users to search for scholarly literature.
  • Google SketchUp - A great tool for users to create and share 3-D models.
  • Google Street View - Another great service that allows anyone to drive down the streets around the world.
  • Google News - Great news site automatically generated using the results of news sites queried by Google.
  • Google Patents- Allows users to search over 7 million patents.
  • Google SMS - Enables users to send text messages over their mobile using SMS to get quick answers such as driving directions, movie show times, local business listing, etc.
  • Google Talk - Instant Messenger program.
  • Google Toolbar - For Microsoft Windows Internet Explorer and Firefox users, this software add-on enables users using these browsers to have access to the Google search and other Google features any time the browser window is open.
  • Google Translator - Translate a foreign language web page or text into your language.
  • Google Trends - List of the 100 most active search queries and comparison of what people are searching for on Google.
  • Google URL Shortener - Service to shorten long URLs.
  • Google Video - Search for online videos hosted by Google as well as transcript text of videos and TV shows.
  • Google Voice - Use Google search over the phone using your voice.
  • Google Web Accelerator - For broadband users, this Microsoft Windows software utility can help speed up browsing times by utilizing Google's global computer network.
  • Google Webmaster tools - Another great service provided by Google that enables webmasters to view, maintain, and control how Google indexes their web page.
  • Google Zeitgeist - A listing of some of the top searches on Google.
  • Google.org - The philanthropic arm of Google.
  • iGoogle - Personalized Google page that enables you to add links, RSS feeds, games, and much more. To get to this from the Google main page click the iGoogle link in the top right corner.
  • Orkut - A social networking site that provides you a location to socialize with your friends and family, and meet new acquaintances from all around the world. Google announced the Orkut service will stop September 30, 2014.
  • Picasa - A great free Microsoft Windows software program to view images, manage images, and much more.
  • YouTube - Video service that allows users to freely upload videos and view others videos.

Thursday, February 12, 2015

What Is Remote Access to Computer Networks?


In computer networking, remote access technology allows logging into a system as an authorized user without being physically present at its keyboard.Remote access is commonly used on corporate computer networks but can also be utilized on home networks.

Remote Desktop

The most sophisticated form of remote access enables users on one computer to see and interact with the actual desktop user interface of another computer. Setting up remote desktop support involves configuring software on both the host (local computer controlling the connection) and target (remote computer being accessed). When connected, this software opens a window on the host system containing a view of the target's desktop.
Current versions of Microsoft Windows include Remote Desktop Connection software. However, this software package only supports target computers running Professional, Enterprise or Ultimate versions of the O/S, making it unsuitable for use with many home networks. For Mac OS X computers, the Apple Remote Desktop software package is also designed for business networks and sold separately. For Linux, various remote desktop software exists.
Many remote desktop solutions are based on Virtual Network Computing (VNC)technology. Software packages based on VNC work across multiple operating systems. The speed of VNC and any other remote desktop software can vary, sometimes performing effectively the same as the local computer but other times exhibiting sluggish responsiveness due to network latency.

Remote Access to Files

Basic remote network access allows files to be read from and written to the target, even without remote desktop capability in place. Virtual Private Network (VPN) technology provides remote login and file access functionality across wide area networks (WANs). A VPN requires client software be present on host systems and VPN server technology installed on the target network. As an alternative to VPNs, client/server software based on the secure shell (SSH) protocol can be also be used for remote file access. SSH provides a command line interface to the target system.
File sharing within a home or other local area network (LAN) is generally not considered to be a remote access environment.

Wednesday, February 11, 2015

Computer Server


http://www.americancomfortheating.com/wp-content/uploads/2012/02/CERN.computer-server-room-300x199.jpg


Server

A server is a computer that provides data to other computers. It may serve data to systems on a local area network (LAN) or a wide area network (WAN) over the Internet.

Many types of servers exist, including web servers, mail servers, and file servers. Each type runs software specific to the purpose of the server. For example, a Web server may run Apache HTTP Server or Microsoft IIS, which both provide access to websites over the Internet. A mail server may run a program like Exim or iMail, which provides SMTP services for sending and receiving email. A file server might use Samba or the operating system's built-in file sharing services to share files over a network.

While server software is specific to the type of server, the hardware is not as important. In fact, a regular desktop computers can be turned into a server by adding the appropriate software. For example, a computer connected to a home network can be designated as a file server, print server, or both.

While any computer can be configured as a server, most large businesses use rack-mountable hardware designed specifically for server functionality. These systems, often 1U in size, take up minimal space and often have useful features such as LED status lights and hot-swappable hard drive bays. Multiple rack-mountable servers can be placed in a single rack and often share the same monitor and input devices. Most servers are accessed remotely using remote access software, so input devices are often not even necessary.

While servers can run on different types of computers, it is important that the hardware is sufficient to support the demands of the server. For instance, a web server that runs lots of web scripts in real-time should have a fast processor and enough RAM to handle the "load" without slowing down. A file server should have one or more fast hard drives or SSDs that can read and write data quickly. Regardless of the type of server, a fast network connection is critical, since all data flows through that connection.


The following thing in Server are as:-

A computer or device on a network that manages network resources. There are many different types of servers. For example:
Servers are often dedicated, meaning that they perform no other tasks besides their server tasks. On multiprocessing operating systems, however, a single computer can execute several programs at once. A server in this case could refer to the program that is managing resources rather than the entire computer.

Tuesday, February 10, 2015

What is OSI(Open System Interconnection) Model

OSI (Open System Interconnection)

 

OSI Model - upper and lower layers -

Layers of the OSI Model

Definition: The OSI model defines internetworking in terms of a vertical stack of seven layers. Upper layers of the OSI model represent software that implements network services like encryption and connection management. Lower layers of the OSI model implement more primitive, hardware-oriented functions like routing, addressing, and flow control. 


Data communication in the OSI model starts with the top layer of the stack at the sending side, travels down the stack to the sender's lowest (bottom) layer, then traverses the physical network connection to the bottom layer on the receiving side, and up its OSI model stack.

 

The OSI model was introduced in 1984. Designed to be an abstract model and teaching tool, the OSI model remains a useful for learning about today's popular network technologies like Ethernet and protocols like IP.



Examples: Internet Protocol (IP) corresponds to the Network layer of the OSI model, layer three. TCP and UDP correspond to OSI model layer four, the Transport layer. Lower layers of the OSI model are represented by technologies like Ethernet. Higher layers of the OSI model are represented by application protocols like TCP and UDP.

 

1. Short for Open System Interconnection, OSI is a network model developed by ISO in 1978 where peer-to-peer communications are divided into seven layers. Each layer performs a specific task or tasks, and builds upon the preceding layer until the communications are complete. Below are the purposes of each of the seven layers.

 

1 - Physical layer - responsible for the electrical, mechanical, and timing across the link.
2 - Data link layer (also known as the link layer) - responsible for transmitting data across a link.
3 - Network layer - responsible for routing information through the network and allowing systems to communicate.
4 - Transport layer - responsible for transferring information between endpoints on the network and deals with errors such as lost or duplicate packets.
5 - Session layer - responsible for managing a session between two applications.
6 - Presentation layer - responsible for the data formatting and display, allowing for compatibility.
7 - Application layer - responsible for user interaction. An example of an OSI application is the FTAM.

2. Short for Open-Source Initiative, OSI is a non-profit corporation dedicated to managing and promoting Open Source.

What is Network?


Computer network

Network

1. A collection of computers, servers, mainframes, network devices, peripherals, or other devices connected to one another allowing for data to be shared and used. A great example of a network is the Internet, connecting millions of people all over the world together.
Below is an example image of what a home network or small office network may look like. As you can see in the image, this network is setup to enable all computers and other network devices with network abilities, such as the Tivo unit, to communicate with each other, as well as share the single Internet connection.

Other examples of network devices

Any device capable of connecting to a network is considered a network device. Below are some of the more common network devices you are likely to find on a home network.
  • Computer (e.g. desktop, laptop, or server computer)
  • Console
  • Firewall
  • Hub
  • Router
  • Smartphone
  • Switch
  • Webcam

Network topologies and types of networks

A network can be setup in dozens of different ways known as network topologies. Common configurations include the bus topology, mesh topology, ring topology, star topology, tree topology and hybrid topology. Most home users have a home network with a tree topology that is connected to the Internet. Many corporate networks will use the tree topology setup as well, but they typically have many more star networks and may also have an Intranet for employees only.


2. Network is also the name of an icon and section in Microsoft Windows that allows users to browse other available resources on their network. See the My Network definition for further information on this term and related links.

Sunday, February 8, 2015

WhatsApp: Why we love and hate the popular messaging service

WhatsApp: Why we love and hate the popular messaging service

WhatsApp: Why we love and hate the popular messaging service

Reasons why we love and hate WhatsApp, the popular mobile messaging service...
The advent of the instant messaging app on smartphones has completely revolutionised the way we communicate. Here are some ways how it has come about:

The benefits...


1. Wishing on festivals and special days used to cost a bomb with telcos charging standard SMS and call rates on those days. With WhatsApp, we do not have to care for the rates any more

2. Standard smileys were common in SMS language, but WhatsApp emojis have rendered some words unnecessary. An emoji of two beer mugs clunking does a better job than 'Cheers!'

3. Earlier, sharing pictures instantly meant mailing them, putting them up on Facebook or sending through an MMS. Now, you can just click and share in no time.

4. We actually used to ring the doorbell to our friend's house and then we took to calling them. Now we WhatsApp them that we're waiting outside.

5. Earlier you had to try hard to avoid a group of people in chat — now you can set a lot of them on permanent mute.

...and the drawbacks


1. As if annoying phone calls, spam mails and text messages were not enough, tele-marketers are now sending out WhatsApp pings.

2. Any modicum of privacy we might have salvaged from a world going rapidly digital has been stripped to its last bone, after WhatsApp introduced the blue tick 'message seen' feature.

Friday, February 6, 2015

Hide Files or Folders Using Command Prompt


Hide Files or Folders Using Command Prompt
This is my second instructable. This one is totally different from my previous post...

In this esteemed instructable i'll be guiding you to hide a folder by using cmd.. Even the folder option method won't be able to track the hidden folder

You'll need
1. Windows based operating system

Step 1: Run Command Prompt and Basic Text Commands

There are several methods to run cmd.. Some of them are listed below

1. Start -> Run -> Cmd
2. Starrt -> Program Files -> Accessories - > Command Prompt

Command Prompt is a newer version of Dos and other os similar to that.. In order to fulfill your needs to hide a folder you must atleast know some basic commands ...

Cd - navigates through a folder
Md - creates a folder
Dir - Directory list
Attrib - provides with various attrib features

Step 2: Hide d targeted folder

Alright, it's time to hide the folder

Presuming that I have a folder named Secret in F:\ Drive
Here are the steps to do

First of all navigate through the drive u want...
type in c:
d:
e:

or whatever ... depends upon where your folder is actually located..

Type in cd and then the folder's name to hide a folder within another folder

Now type in Attrib +h +s +r and the folder's name
here's the format

Attrib +h +s +r secret                           (Note: Secret refers to the folder to be hidden)

The folder is hidden and noone can access the folder but u..

Now if u want to view the folder
reverse the process
instead of   Attrib +h +s +r secret  type in
Attrib -h -s -r secret

Step 3: Instant Access to the folder

Here's a cool tip to access the folder even while the folder is hidden...

Open My Computer and type in      f:\secret


Cool Right?

Thursday, February 5, 2015

How to Hide any Local Drive using Command prompt




 Today Computer World tutorial is about how to hide a local drive without any 3rd party software. There are lots of free and payable software’s available to hide local drive, but I’m not gonna talk about hide a local drive using a software. In this tutorial I’ll show you an easiest way to hide local drive without using software. This will save your both money and time.



There are 3 methods available to hide a local drive without using any software

1. Hide a drive through gpedit
2. Hide a drive through regedit
3. Hide a drive using command prompt

 Now I am covering, command prompt way of doing it. So lets see how to do.

How to Hide a Local Drive using command prompt?

1. Click on Start - Run

2. In Run box type cmd and hit Enter. Now Command Prompt window will appear.

3. In command prompt, type diskpart and hit Enter.

4. Then type list volume and hit Enter.

Now it will display the list of all your computer drives details.

5. Then type the Drive Letter which you want to hide.
If you want to hide volume E, type select volume E and hit Enter.

Now follow mentioned massage will appear to you.
Volume 4 is the selected volume

6. After that, type remove letter E and hit an Enter.

That’s all, you have done. Now restart your computer once. When you start your PC again, you want be able to see the particular drive in My Computer.


How to get back Hidden Drive again in My Computer.

Do the procedure which i have mentioned in step 1,2,3,4 and 5 again.

Click Start —> Run —> cmd —>

Then type diskpart - list volume - select volume E

After that type assign letter E and hit Enter.

That’s all !! You have got back the hidden local drive. Once again restart your PC, now you will be able to see hidden local drive in My Computer.

Note: Your PC doesn't lost any data by doing this trick .

Sunday, February 1, 2015

Difference between 2G and 3G Technology


Second Generation (2G) technology was launched in the year 1991 in Finland. It is based on the technology known as global system for mobile communication or in short we can say GSM. This technology enabled various networks to provide services like text messages, picture messages and MMS. In this technology all text messages are digitally encrypted due to which only the intended receiver receives message. These digital signals consume less battery power, so it helps in saving the battery of mobiles.
 
The technologies used in 2G are either TDMA (Time Division Multiple Access) which divides signal into different time slots or CDMA (Code Division Multiple Access) which allocates a special code to each user so as to communicate over a multiplex physical channel.
 
3G technology generally refers to the standard of accessibility and speed of mobile devices. It was first used in Japan in the year 2001. The standards of the technology were set by the International Telecommunication Union (ITU). This technology enables use of various services like GPS (Global Positioning System), mobile television and video conferencing. It not only enables them to be used worldwide, but also provides with better bandwidth and increased speed.
 
This technology is much more flexible as it can support 5 major radio technologies that operate under CDMA, TDMA and FDMA. CDMA accounts for IMT-DS (direct speed), IMT-MC (multi carrier). TDMA holds for IMT-TC (time code), IMT-SC (single carrier). This technology is also comfortable to work with 2G technologies. The main aim of this technology is to allow much better coverage and growth with minimum investment.
 
2G vs 3G Technology
Figure: Evolution of Mobile system from 2G to 3G
 
 
Difference between 2G and 3G Technology
·         Cost: The license fee to be paid for 3G network is much higher as compared to 2G networks. The network construction and maintenance of 3G is much costlier than 2G networks. Also from the customers point of view the expenditure for 3G network will be excessively high if they make use of the various applications of 3G. 
 
·         Data Transmission:  The main difference between 2G and 3G networks is seen by the mobile users who download data and browse theInternet on the mobile phones. They find much faster download speeds, faster access to the data and applications in 3G networks as compared to 2G networks. 2G networks are less compatible with the functions of smart phone. The speed of data transmission in 2G network is less than 50,000 bits per sec while in 3G it can be more than 4 million bits per sec.
 
·         Function: The main function of 2G technology is the transmission of information via voice signals while that of 3G technologies is data transfer via video conferencing, MMS etc.
 
·         Features: The features like mobile TV, video transfers and GPS systems are the additional features of 3G technology that are not available with 2G technologies.
 
·         Frequencies: 2G technology uses a broad range of frequencies in both upper and lower bands, under which the transmission depends on conditions such as weather. A drawback of 3G is that it is simply not available in certain regions.
 
·         Implication: 3G technology offers a high level of security as compared to 2G technology because 3G networks permit validation measures when communicating with other devices. 
 
·         Making Calls: Calls can be made easily on both 2G and 3G networks with no real noticeable differences except that in 3G network video calls can also be made. The transmission of text messages and photos is available in both the networks but 2G networks have data limit and the speed of the data transmission is also very slow as compared to 3G.
 
·         Speed:  The downloading and uploading speeds available in 2G technologies are up to 236 Kbps. While in 3G technology the downloading and uploading speeds are up to 21 Mbps and 5.7 Mbps respectively

WHAT IS 3G


Online through 3G modem mobile - pictafolio/E+/Getty Images
pictafolio/E+/Getty Images

Definition of 3G:
3G is the third generation of wireless technologies. It comes with enhancements over previous wireless technologies, like high-speed transmission, advanced multimedia access and global roaming. 3G is mostly used with mobile phones and handsets as a means to connect the phone to the Internet or other IP networks in order to make voice and video calls, to download and upload data and to surf the net.
How is 3G Better?:
3G has the following enhancements over 2.5G and previous networks:
  • Several times higher data speed;
  • Enhanced audio and video streaming;
  • Video-conferencing support;
  • Web and WAP browsing at higher speeds;
  • IPTV (TV through the Internet) support.
3G Technical Specifications:
The transfer rate for 3G networks is between 128 and 144 kbps (kilobits per second) for devices that are moving fast and 384 kbps for slow ones(like for pedestrians). For fixed wireless LANs, the speed goes beyond 2 Mbps.
3G is a set of technologies and standards that include W-CDMA, WLAN and cellular radio, among others.
3G follows a pattern of G's that started in the early 1990's by the ITU. The pattern is actually a wireless initiative called the IMT-2000 (International Mobile Communications 2000). 3G therefore comes just after 2G and 2.5G, the second generation technologies. 2G technologies include, among others, the Global System for Mobile (GSM) - the famous mobile phone technology we use today. 2.5G brings standards that are midway between 2G and 3G, including the General Packet Radio Service (GPRS), Enhanced Data rates for GSM Evolution (EDGE), Universal Mobile Telecommunications System (UMTS) etc.
What is Required for Using 3G?:
The first thing you require is a device (e.g. a mobile phone) that is 3G compatible. This is where the name 3G phone comes from - a phone that has 3G functionality; nothing to do with the number of cameras or the memory it has. An example is the iPhone 3G.
3G phones commonly have two cameras since the technology allows the user to have video calls, for which a user-facing camera is required for capturing him/her.
Unlike with Wi-Fi which you can get for free in hotspots, you need to be subscribed to a service provider to get 3G network connectivity. We often call this kind of service a data plan or network plan.
Your device is connected to the 3G network through its SIM card (in the case of a mobile phone) or its 3G data card (which can be of different types: USB, PCMCIA etc.), which are both generally provided/sold by the service provider. Through that, you get connected to the Internet whenever you are within a 3G network. Even if you are not in one, you can still use 2G or 2.5G services provided by the service provider.
What Does 3G Cost?:
3G is not very cheap, but it is worthwhile for users that need connectivity on the move. Some providers offer it within a somewhat costly package, but most of them have plans where the user pays for the amount of data transferred. This is because the technology is packet-based. For example, there are service plans where there is a flat rate for the first Gigabyte of data transferred, and a per minute cost for each additional Megabyte.
3G and Voice:
Wireless technologies are a way for mobile users to make free or cheap calls worldwide and save a lot of money due to the latest telephony applications and services. 3G networks have the advantage of being available on the move, unlike Wi-Fi, which is limited to a few meters around the emitting router. So, a user with a 3G phone and a 3G data plan is well-equipped for making free mobile calls. She will only have to download one of the free applications and install on her mobile phone and start making calls. 

Is the Internet Bad for Society and Relationships?

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